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Math Help - How many people can be fed?

  1. #1
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    How many people can be fed?

    When sizes of pizzas are quoted in inches, the number quoted is the diameter of the pizza. A restaurant advertises an 8- "personal pizza." If this 8- pizza is the right size for one person, how many people can be fed by a large 16- pizza?

    This is suppose to be simple, but i dont know why i am having trouble.
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  2. #2
    MHF Contributor

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    I presume that when feeding a number of people from a pizza, they will get "enough to eat" if they get the same area as from an 8 inch pizza.

    The area of a circle is given by \pi r^2= \frac{\pi}{4}d^2. If you double the diameter of the circle what happens to the area?

    (If you can't answer that directly, calculate the area with d= 8, and with d= 16, and compare those values.)
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  3. #3
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    Thank you! I found the answer!
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